Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 165 · 40 questions

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

1. 1.Which is closest to 697 × 38? (Round each number first.) (a) 280000 (b) 2800 (c) 56000 (d) 28000
2. 2.Which is closest to 896 + 696 + 600? (a) 2400 (b) 2200 (c) 2100 (d) 2300
3. 3.Which is closest to 406 ÷ 21? (a) 40 (b) 200 (c) 20 (d) 10
4. 4.Which is closest to 198 × 39? (Round each number first.) (a) 800 (b) 16000 (c) 8000 (d) 80000
5. 5.Round 26.86 to one decimal place. =
6. 6.Which is closest to 303 × 71? (Round each number first.) (a) 42000 (b) 210000 (c) 2100 (d) 21000
7. 7.Which is closest to 303 × 61? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
8. 8.Round 69.32 to one decimal place. =
9. 9.Which is closest to 1196 ÷ 39? (a) 300 (b) 15 (c) 30 (d) 60
10. 10.Round 72.49 to one decimal place. =
11. 11.Which is closest to 399 × 29? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
12. 12.Round 18.38 to one decimal place. =
13. 13.Which is closest to 203 × 69? (Round each number first.) (a) 28000 (b) 1400 (c) 14000 (d) 140000
14. 14.Round 56377 to the nearest thousand.
15. 15.Which is closest to 604 × 82? (Round each number first.) (a) 48000 (b) 480000 (c) 96000 (d) 4800
16. 16.Round 71412 to the nearest ten.
17. 17.Which is closest to 395 + 903 + 400? (a) 1900 (b) 1800 (c) 1700 (d) 1600
18. 18.Which is closest to 596 + 502 + 503? (a) 1600 (b) 1800 (c) 1500 (d) 1700
19. 19.Which is closest to 2999 ÷ 51? (a) 30 (b) 120 (c) 600 (d) 60
20. 20.Which is closest to 599 × 18? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
21. 21.Which is closest to 3609 ÷ 39? (a) 90 (b) 45 (c) 900 (d) 180
22. 22.Which is closest to 698 × 29? (Round each number first.) (a) 210000 (b) 21000 (c) 2100 (d) 42000
23. 23.Round 73438 to the nearest ten.
24. 24.Round 93136 to the nearest ten.
25. 25.Round 64649 to the nearest hundred.
26. 26.Which is closest to 1994 ÷ 49? (a) 40 (b) 400 (c) 20 (d) 80
27. 27.Which is closest to 597 + 400 + 803? (a) 1700 (b) 2000 (c) 1800 (d) 1900
28. 28.Which is closest to 702 × 89? (Round each number first.) (a) 126000 (b) 6300 (c) 63000 (d) 630000
29. 29.Round 82797 to the nearest thousand.
30. 30.Which is closest to 2806 ÷ 39? (a) 70 (b) 700 (c) 140 (d) 35
31. 31.Which is closest to 797 + 396 + 602? (a) 1900 (b) 1800 (c) 2000 (d) 1700
32. 32.Which is closest to 495 + 301 + 302? (a) 1000 (b) 1200 (c) 1300 (d) 1100
33. 33.Which is closest to 1506 ÷ 29? (a) 100 (b) 25 (c) 50 (d) 500
34. 34.Which is closest to 1609 ÷ 41? (a) 80 (b) 400 (c) 20 (d) 40
35. 35.Which is closest to 501 × 40? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000
36. 36.Which is closest to 2009 ÷ 49? (a) 20 (b) 80 (c) 40 (d) 400
37. 37.Which is closest to 396 × 70? (Round each number first.) (a) 280000 (b) 28000 (c) 2800 (d) 56000
38. 38.Which is closest to 797 × 72? (Round each number first.) (a) 112000 (b) 560000 (c) 56000 (d) 5600
39. 39.Which is closest to 100 + 496 + 201? (a) 1000 (b) 900 (c) 800 (d) 700
40. 40.Round 26334 to the nearest thousand.

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